Just now getting to this. Reminds me of last year sometimes making two trips in one day to the range to try out and proof my 6.5 creed loads.
At this point I'd not fret it too much. Yes you'll be shooting out to a mile (maybe further if Taos lets you). Most of the targets will be in closer though. I believe we went out to 500 then jumped to 1100+ and then 1300+ before jumping to 1,700 then 2,000 yards. At 2,000 yds we were pretty much just flinging lead and watching for an impact, but for the most part was pretty futile.
For the next go around I'd highly suggest H4350 and Hornady eld-M pills.
My Ruger really liked those and it did a fairly decent job at the last Appleseed shoot.
Just go and have fun and learn! Taos is a great instructor!
Hopefully you've got your drop charts printed for the bullets and speed you'll be shooting them at. IIRC the elevation is 7,000 feet or close to it.
Good luck and keep us updated!